<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
            <img src="../assets/logo.png" alt="">    
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid
"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default{
        data(){
            return{
                //这是登陆表单的数据绑定对象
                loginForm:{
                    username:'admin',
                    password:'123456',
                },
                //这是表单的验证规则对象
                loginFormRules:{
                    username:[
                        {required:true,message:"请输入登录名称",trigger:"blur"},
                        {min:3,max:10,message:"长度在3到10个字符",trigger:"blur"}
                    ],
                    password:[
                    {required:true,message:"请输入登录密码",trigger:"blur"},
                    {min:6,max:15,message:"长度在6到15个字符",trigger:"blur"}
                    ]
                }
            };
        },
        methods:{
            //点击重置按钮，重置登录表单
            resetLoginForm(){
                //console.log(this)
                this.$refs.loginFormRef.resetFields();
            },
            login(){
                this.$refs.loginFormRef.validate(async valid =>{
                    if(!valid) return;
                    const {data:res}=await this.$http.post("login",this.loginForm);
                    if(res.meta.status!==200) return this.$message.error("登录失败！");
                    this.$message.success("登陆成功");
                    //1.将登陆成功之后的token，保存到客户端的sessionStorage中
                    //    1.1 项目中除了登陆之外的其他API接口，必须在登录之后才能访问
                    //    1.2 token 只应在当前网站打开期间生效，所以将token 保存在sessionStorage中
                    window.sessionStorage.setItem("token",res.data.token);
                    //2.通过编程式导航跳转到后台主页，路由地址是/home
                    this.$router.push("/home"); 
                });
            }
        }
    };
</script>

<style lang="less" scoped>
.login_container{
    background-color:#2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius:3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform:translate(-50%,-50%); 
}
.avatar_box{
    height: 130px;
    width: 130px;
    border:1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow:0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
        width:100%;
        height: 100px;
        border-radius: 50%;
        background-color: #eee;
    }
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding:0 20px;
    box-sizing:border-box
}
.btns{
    display:flex;
    justify-content:flex-end;
}

</style>